he mean squared error of a regression is: Equal to R². O Equal to Adjusted R?. O A measure of fit. O Useful when testing whether all slope coefficients are jointly significant.
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- What is differance between three sector ecnomoy and four sector ecnomoy18. What is the type of sample statistic that is used to make inferences about a given type ofpopulation or parameter?A. Confidence interval of that parameterB. Confidence level of that parameterC. Estimator of that parameterD. Point estimate of that parameter 20. As the number of subjects in a trial increase, the _____.A. Clinical relevance increasesB. The confidence interval decreasesC. The number needed to treat increasesD. The power of the study decreases 49. All of the following is true regarding incidence, EXCEPT:A. Every person in the numerator must have the potential to become one of the people in thedenominator.B. For the denominator, we have the number of people at risk for the disease during aspecified time period.C. For the numerator, we indicate the number of new cases of a disease during a specifiedtime periodD. Measures of disease frequency needed to generate evaluation of the association betweenexposure and outcomeStates (and provinces) that have control over taxation sometimes reduce taxes in an attempt to spur economic growth. Suppose that you are hired by a state to estimate the effect of corporate tax rates on, say, the growth in per capita gross state product (GSP).(i) What kind of data would you need to collect to undertake a statistical analysis?(ii) Is it feasible to do a controlled experiment? What would be required?(iii) Is a correlation analysis between GSP growth and tax rates likely to be convincing? Explain.
- A stock analyst wants to determine whether there is a difference in the mean rate of return for three types of stock: utility, retail, and banking stocks. The following output is obtained: Using the 0.05 level of significance, is there a difference in the mean rate of return among the three types of stock? Can the analyst conclude there is a difference between the mean rates of return for utility and retail stocks? For utility and banking stocks? For banking and retail stocks? (Negative value should be indicated by a minus sign.)Explain Conditional Mean Independence by considering a regression with two regressors?The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 450 employed persons and 477 unemployed persons are independently and randomly selected, and that 291 of the employed persons and 242 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers ( p1 ), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.05 for the test. Step 3 of 6 : Compute the weighted estimate of p, p‾ . Round your answer to three decimal places.
- The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 450 employed persons and 477 unemployed persons are independently and randomly selected, and that 291 of the employed persons and 242 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers ( p1 ), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.05 for the test. Step 2 of 6 : Find the values of the two sample proportions, pˆ1 and pˆ2 . Round your answers to three decimal places.The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 450 employed persons and 477 unemployed persons are independently and randomly selected, and that 291 of the employed persons and 242 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers ( p1 ), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.05 for the test. Step 1 of 6 : State the null and alternative hypotheses for the test.The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 450 employed persons and 477 unemployed persons are independently and randomly selected, and that 291 of the employed persons and 242 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers ( p1 ), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.05 for the test. Step 4 of 6 : Compute the value of the test statistic. Round your answer to two decimal places.
- Define the Ordinary Least Squares Estimator? how OLS Estimates the Relationship Between Test Scores and the Student–Teacher Ratio?Suppose you examined blood of 36 patients with the aim to study the relation between sugar level in blood (in mg/dL) and the amount of artificial sweetener (measured in grams). Your regression shows: blood=7.1 + 0.4*sweatener - 0.2*female. What is the most precide interpretation of the estimated coefficient for sweetener?Suppose that we want to compare the cholestrol contents of four competing diet foods on the basis of the following data (in milligrams per package) which were obtained for three 6-ounce packages of each of the diet foods: Diet food A: 3.6 4.1 4.0 Diet food B : 3.1 3.2 3.9 Diet food C: 3.2 3.5 3.5 Diet food D: 3.5 3.8 3.8 a) Fill in the blanks below. b) Test at the 0.05 level of significance whether the differences among means obtained for the four competing diet foods ( Diet A, B, C, D ) are significant? (Ftable=4.07) ONE-WAY ANOVA TABLE Source of Variation Degrees of Freedom Sum of Squares Mean Square F Treatments ? 0.54 ? ? Error ? ? ? Total ? 1.18